Patent AU-2018347195-B2 (AU)
Title: System and method for information protection
Inventor: MA HUANYU
IPC: G06F21/10
Filed: 2018-11-27
Granted: 2020-09-24
Abstract: INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) 
(19) World Intellectual Property 
(1) Organization11111111111111111111111I1111111111111i1111liiiii 
International Bureau (10) International Publication Number 
(43) International Publication Date W O 2019/072277 A2 
18 April 2019 (18.04.2019) W IPO I PCT 
(51) International Patent Classification: Department 5/F, Building 3, No.969 West Wen Yi Road, 
Not classified Yu Hang District, Hangzhou, Zhejiang 311121 (CN).  
(21) International Application Number: (74) Agent: BEIJING BESTIPR INTELLECTUAL PROP
PCT/CN2018/117558 ERTY LAW CORPORATION; Room 409, Tower B, Ka 
(22)InternationalFilingDate: Wal Building, No. 9 Shangdi 3rd Street, Haidian District, 
27 November 2018 (27.11.2018) Beijing100085(CN).  
(81) Designated States (unless otherwise indicated, for every 
(25)FilingLanguage: English kind ofnational protection available): AE, AG, AL, AM, 
(26) Publication Language: English AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, 
CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, 
(71)Applicant: ALIBABAGROUPHOLDING LIMITED DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, 
[-/CN]; Fourth Floor,One Capital Place,P.O.BOX847 HR, HU, I), IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, 
GeorgeTown,GrandCayman(KY). KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, 
(72) Inventors: MA, Huanyu; Alibaba Group Legal Depart- MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, 
ment 5/F, Building 3, No.969 West Wen Yi Road, Yu OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, 
HangDistrict, Hangzhou, Zhejiang 311121 (CN). ZHANG, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, 
Wenbin; Alibaba Group Legal Department 5/F, Building 3, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.  
No.969 West Wen Yi Road, Yu Hang District, Hangzhou, (84) Designated States (unless otherwise indicated, for every 
Zhejiang 311121 (CN). MA, Baoli; Alibaba Group Legal kind of regional protection available): ARIPO (BW, GH, 
Department5/F,Building3,No.969WestWenYiRoad GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, 
Yu Hang District, Hangzhou, Zhejiang 311121 (CN). LIU, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, 
Zheng; Alibaba Group Legal Department 5/F, Building 3, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, 
No.969 West Wen Yi Road, Yu Hang District, Hangzhou, EE,ES,FIFR,GB,GR,HR,HU,IIS,IT,LT,LU,LV, 
Zhejiang 311121 (CN). CUI, Jiahui; Alibaba Group Legal MC, MK, MT, NL, NO, PL, PT,RO, RS, SE,SI, SK, SM, 
HE (54) Title: SYSTEM AND METHOD FOR INFORMATION PROTECTION 
300 (57) Abstract: A computer-implemented method for information protection com
prises: committing a transaction amount of a transaction with a first commitment 
3comttnghametoranc saounttotransactonit t d scheme to obtain a transaction commitment value, committing a change of the commitment scheme to obtain atransacion commitment value T. and 
committing a change y of the transaction with a second commitment transaction with a second commitment scheme to obtain a change commitment 
scheme to obtain a change commitment value Y, the first commitment value, the first commitment scheme comprising a transaction blinding factor, and 
emempnsichemeran a a antio blinding actor°° the second commitment scheme comprising a change blinding factor; encrypting commitment................. ch........... ...........i..in ......a .acirtao biatoeoblinh ngdiin ignacoradfhech netitoafrsrk y 
-a first combination of the change blinding factor and the change with afirst key; 
transmitting the transaction blinding factor, the transaction amount, and the trans
302encrypting a first combination of the change blinding factor r, and action commitment value to a recipient node associated with a recipient for the 
the change y with a first key KA recipient node to verify the transaction; in response to that the recipient success
fully verifies the transaction, obtaining an encrypted second combination of the 
transaction blinding factor and the transaction amount encrypted with a second 
303. transmitting the transaction blinding factor r,, the transaction key.  
amount t, and the transaction commitment value T to a recipient node 
associated with a recipient of the transaction for the recipient node to 
- en thtrrlecao 
304in response to that the recipient node successfully verifies the 
transaction, obtaining an encrypted second combination of the 
transaction blinding factor ri and the transaction amount t encrypted 
with a second key KB 
305: transmitting the encrypted first combination and the encrypted 
secondcombinationtoaFplurality of3nodesinablockhainforthenod 
in the blockchain to verify the transaction 
oI.
W O 2019/072277 A2111I|II|I||||||I|||111|1|||I|I|I||||I||||||||||||||||||||||||||||||| 
TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, 
KM, ML, MR, NE, SN, TD, TG).  
Published: 
- upon request of the applicant, before the expiration of the 
time limit referred to in Article 2](2)(a) 
- without international search report and to be republished 
upon receipt of that report (Rule 48.2(g))